Fire-bar for furnaces



J. A. HILL.

FIRE BAR FOR FURNACES- APPLICATION FILED DEC.-2l| 19l8.

1 379,261. Patented May 24, 1921.

ATTORNEY IN '1 run UNITED srnrns JQSEPH ALBERT HILL, OF SHEFFIELD, ENGLAND.

FIRE-BAR FOR FURNACES.

Specification of Letters Patent.

Application filed December 21, 1918. Serial No. 267,789.

To all whom it may concern Be it known that I, JosnrH ALBERT HILL, a subject of the King of Great Britain and Ireland, and residing at Ordnance Works, Bernard Road Park, Shefiield, in the county of York, England, have invented certain new and useful Improved Fire-Bars for Furnaces, of which the following is a specification.

This invention relates to fire-bars for furnaces with particular reference to fire-bars that are to be employed in connection with my well-known type of furnace comprising one or more conduits, each of which is adapted to support a plurality of transverse fire-bars.

The object of the present invention is to produce a form of fire-bar by means of which a greatly increased supply of air or steam may be fed to the fuel while at the same time securing a more even distribution over the whole grate area.

A further advantage secured by the invention which. is of particular utility, for example, with locomotive furnaces, is the great saving of weight which will thereby be effected consistent with the maintenance of the necessary strength.

The invention consists in a fire-bar having a longitudinal bore or aperture therein or therethrough and one or more transverse apertures communicating therewith and with the upper or lower surfaces of the firebar.

The invent-ion also consists in the form of fire-bar hereinafter described.

The accompanying drawings illustrate one form of fire-bar in accordance with the invention.

Figure 1 is a part sectional elevation;

Fig. 2 is a plan,

Fig. 3 is a section on the line A-B of Fig. 1, and

Fig. 4 is an end elevation.

Fig. 5 is a perspective detail showing a plurality of bars mounted on a supporting conduit.

In carrying my invention into effect in one convenient manner, I make my fire-bar somewhat of the usual form having a flat upper surface and of a general wedge shaped formation in vertical section tapering inward toward the bottom, while the lower edges of the central portion a and of the depending end and flanged portion 5 may be rounded as shown for the purpose of facilitating the passage and distribution of the steam or air supplyto the fuel located upon the fire-bars.

The depending end flanged portions permit the bar to rest transversely upon a conduit forming the under part of the grate (not shown), there being usually several of such conduits upon each of which rest a number of fire-bars placed transversely thereof and with the flanged portions fitting snugly in the conduits so as to prevent longitudinal movement of the bars.

Each bar is of a size and shape to suit the conduit or support 9 upon which it is carried and the bars may or may not be formed with projecting lugs c at the end and central portions for the purpose of spacing the bars slightly apart from one another.

According to the invention each bar is provided with a longitudinal bore or passage (Z therein, which bore may extend for the whole length of the bar and which may be of a tapered form in vertical section to suit the taper of the bar, or may be of cir cular or other suitable form in cross-section, while one or more transverse apertures e extend vertically through the lower web of the bar so as to communicate both with the internal bore and with the space below the fire-bars I also provide one or more apertures f in the upper part of the fire-bar extending vertically from the internal bore to the upper surface of the bar, such apertures being, if desired, smaller and more numerous than the apertures in the lower portion or being of any other desired formation and arrangement.

Such a construction of fire-bar not only results in a great saving of weight particularly in cases such as that of a locomotive furnace, where the grate area, and therefore the number of bars required, is considerable, while at the same time the reduction in the amount of weight upon the axles is of considerable importance but also the arrangement insures a thorough and more even distribution of air or steam throughout the whole grate area to the fuel arranged thereon, thereby promoting combustion and materially contributing to the heat efliciency of the furnace.

It is to be understood that fire-bars in accordance with the invention may be applied to industrial, marine, or other boilers of any Patented May 24, 1921.

type or construction, and I may modify the shape and configuration of the bar and the form and arrangement of I bores or other apertures therein depending upon the type of furnace with which the bar is" to be employed or any practical requirements that may have to be fulfilled.

Iaving now described myinvention, what I claim as new and desire to secure by LettersPatent i's:--

A fire-bar for'furnacesl comprising a body portion of a general wedge-shaped formation. inwvertical section tapering inward toward the bottom. and having the lower edge of the central portion rounded, the body being provided with a longitudinal bore throughout its length and also provided with a plurality of vertical transverse bores communicating with the longitudinal bore and with the upper and lower surfaces of the bar, and depending end fiangesupon said body portion having the lower edges rounded and adapted to fit snugly in a supporting conduit so as to prevent longitudinal movement of the bar.

In testimony whereof I have signed my name to this specification. I

JOSEPH ALBERT HILL, 

